Ask them directly on your website by creating a free survey widget.
-Questions you ask your users
It can be one or two questions. Try not to make it too long and complicated. The risk that you will loose the user is very Hugh than.
- Email form
If you would like to capture the email of the person who go through survey you should add also email
Which questions toa to ask your users?
To gather the customer feedback
To measure customer satisfaction
To segment your users